(+) Very suspenseful.
(+) Flawless special effects (Oscar-winning!)
(+) Fantastic camera work.
(+) Very crucial philosophical questions are raised throughout the film.
(+) The movie manages to surprise you often enough with plot twists or other means.
(+) Great very interesting dialogues.
(+) Amazing acting performances.
(+) Smart confrontation with artificial intelligence, offering a couple of good subliminal messages.
(+) Amazing soundtrack.
(+) Great setting, improving the thrill of the plot.